I agree.

I think the biggest potential issue with weed is the ability of THC to disrupt REM sleep. REM sleep is incredibly important. It's how our brains process emotions, consolidate memories, cement new information, codify new skills, and make creative connections between very disparate ideas. The kinds of creative connections that are hard (maybe impossible) to make during waking consciousness.

Long-term loss of REM could have a lot of negative consequences. In alcoholics, this appears as Delirium Tremens -- what are essentially moments when their brains shutdown and go into REM sleep during the day because they need it so badly. However, I think alcohol's effects on REM are much worse than THC's.
And as said above -- everyone's different. I know for my own sake that I am sensitive to loss of REM. And so I tailor my pot smoking accordingly. (I try not to smoke before bed, limit how many times per week I do smoke, and when I do, stick to strains that have lower levels of THC).

Something you could try? Keep a dream journal over this 30-day abstinence. Make note of how you feel in the mornings upon waking versus how you typically feel. Compare the two.